Pen input device sheet and method for manufacturing pen input device sheet

Abstract

A pen input device sheet, which contacts a tip part of a core body of an electronic pen for a pen input device, includes a resin film layer. A diameter of the tip part is SR. An amount of sinking of the resin film layer is δ and a coefficient of kinetic friction between the resin film layer and the tip part is μ, which change according to a load when the tip part is in contact with the pen input device sheet. When the load applied to the tip part of the core body is changed and corresponding measurements are taken, and the measurements plotted with μ allocated to an ordinate axis and a ratio of δ / SR is allocated to an abscissa axis, a fitted straight line plotted based on the measurements has a proportional relation corresponding to a proportional relation between μ and the ratio of δ / SR.

Description

BACKGROUNDTechnical Field[0001]This disclosure relates to a pen input device sheet that is used for a pen input device composed of an electronic pen and a position detecting device that detects an indicated position indicated by this electronic pen and contacts the pen tip of the electronic pen. Furthermore, this disclosure relates to a method for manufacturing a pen input device sheet.Background Art[0002]Recently, pen input devices have come to be used as input devices of small-size pieces of electronic equipment, such as high-function mobile phone terminals called smartphones and pad-type terminals. Reduction in the thickness of electronic pens used for the pen input devices for such small-size pieces of electronic equipment is progressing and electronic pens whose pen tip has the same diameter as the pen tip of commercially-available ballpoint pens are also increasing.[0003]Because of also such a background, the electronic pen has become required to enable input with a feeling of...

AI Technical Summary

Benefits of technology

[0014]Furthermore, in the pen input device sheet according to this disclosure, recesses and protrusions do not need to be provided on the sheet surface. Therefore, although this pen input device sheet is stuck onto the display screen of a display, the deterioration of the display quality of the screen can be prevented. Moreover, the feeling of writing is not caused to appear by only a thin coating layer of a soft resin formed on the surface and this disclosure has a configuration to cause the feeling of writing to appear by including the resin film layer having the characteristic of (expression 1). Thus, the following effects are provided. The thickness can be easily set to a predetermined value or larger and the effect of pen catching generated based on the amount of sinking of the pen input device sheet due to the writing pressure is sufficiently obtained. Furthermore, it is also possible to obtain a feeling of writing on, for example, pieces of paper overlapped in order to generate a sense of resistance by not the core body but the friction force and deformation of the material forming the film.

Problems solved by technology

However, in the method in which the feeling of writing is adjusted by controlling the recess-protrusion shape of the surface of the pen input device sheet, described in Patent Documents 1 and 2, there is a problem that it is impossible to reproduce a feeling (feeling of writing or writing pressure sense) based on denting of paper when writing is carried out on the paper with a pen.

Furthermore, if the pen input device sheet exists over a display screen (pen indication input surface) of a display, there is a problem that, because of the recesses and protrusions of the surface of the transparent sheet, the display quality of the display screen of the display is impaired due to turbidity attributed to a rise in the haze value and rainbow glare attributed to the lens effect.

If the recesses and protrusions of the surface of the pen input device sheet are made small in order to improve display quality, there is a problem that the sense of writing due to the effect of the recesses and protrusions is lowered.

For this reason, there is a problem that the pen-catching suppression effect generated based on the amount of sinking of the pen input device sheet (film) due to the writing pressure is small and it is impossible to obtain a feeling of writing like that to pieces of paper overlapped in order to generate a sense of resistance by the friction force of the material.

However, this method involves the following problems.

The expense for the firm coating corresponding to the soft resin is necessary and the cost becomes high.

In addition, the coating has a drawback in the durability and the coating at the writing place peels away.

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